The 1st version of Nothing was actually recorded with 7 strings tuned like the 8s were to be. They had tried 8s and had decided to go that way, but they didn't yet have a good enough 8 string guitar. As it turned out, doing it with a 7s tuned to F was not good either.. they would barely stay in tune for a whole riff. That's 1 improvement the re-recording has, you can actually properly hear what notes are being played.
I wish they'd piss them off. It's a cool idea and they've made some cool unique music with them, but I think they're restricting in their own way. Plus it actually loses heavyness without the bass doing the lower octave. Even if it was there it'd basically be inaudible (more or less just a presense), and would ad none of the low midrange growl that DEI and Chaosphere bass tones have. It's funny.. the pre 8 string albums are ultimately tuned lower. With 8 strings it's just like having 3 standard basses tuned UP a bit. Shit.